No, what you said was people who decided to vote 3rd party as a statement of anger to their party are responsible for deaths in Iraq. That remark is disgusting.
"Making a statement" has real consequences for real people. If you didn't know that then, you have no excuse for not knowing it now.
Nader is morally culpable, he knew as well as most Democrats that a Bush administration meant war. He thought a Bush disaster would get people to overthrow the two-party system.
The people who voted for Nader and did not know what he was up to are too stupid to be morally culpable.